Pump jack



Nov 9, 1926. 1,606,263

J. F. RCGERS PUMP JACK Fil ed May 21, 1926 Patented Nov. 9, 1926.

JESSE F. ROGERS, OF FRESNO, CALIFORNIA.

,PUMP JA K.

Application filed May 21, 1926. Serial No. 110,770.

My invention relates to a pump jack, and more specifically to a device for reducing friction between the driving means of the jack and the stationary member adjacent thereto.

The object I have accomplished is a combination of rollers and levers which when assembled with the piston rod of a pump or other rod adapted to be moved up and down, will reduce the friction between the driving means and the guide.

It is well known that in pumps using pistons as means for lifting the fluid, it is necessary to have'a pump rod attached to the piston, and to have power applied to the piston to move it up and down, that usually 7 such power is applied by means of a. lever,

and the rod is operated through guides to i ated with a lever.

give it a straight up and down movement, and that in operating the lever, therod is pulled to one side or the other against the guides, causing undue friction.

In my device the friction caused by such application of power is eliminated. This object and other objects hereinafter set forth are accomplished by means of the device hereinafter described and illustrated on the accompanying drawing, in which Figure 1 shows a front view of my device when oper- Figure 2 is a side View of Figure 1. Figure 3 is an enlarged view of the assembled cams and rollers.

In said figures, 4 represents a base for the device. 5 and 5 are guides attached to said base in which the piston rod 6 is operated up and down. These guides should be aligned so that the piston rod can move up and down therein. On rod 6 I have attached two idlers, the upper idler being designated as 7, and the lower idler as 12. These should be pivoted so they will rotate freely. On base 4 I have pivoted a lever 9 at one end thereof, the pivot being designated 19, and at the opposite end of the lever at end 29 I have attached means for applying power to said lever. This means is shown as a rod 17, or equivalent thereof. The lever 9 has a curved upper surface and is positioned on base 4L so that when it is moved upward idler 7 will roll onthe upper surface of lever 9. The curvature of the upper surface of this lever is such that it re quires a uniform power to pull the rod upward at all times during the stroke of said lever. 22 is an arm attached to base 4, which is adapted to be used as a fulcrum for lever 21, one end of which is adapted to be pivoted to rod 17, and the other end being adapted to have power applied thereto.

It is noted, however,that the arm 22 and lever 21 can be dispensed with and other means for giving the rod 17 an up and down movement may be substituted.

I have also provided an auxiliary lever 8, which is pivoted to the base 4 with a pivot 18 and which is connected to lever 9 with a link 28. Lever 8 has a curved under surface corresponding with the curved upper surface of lever 9. Idler'12 is pivoted to rod 6 in such position .so that on the up and down movement of rod 6, the idler engages the curved periphery of lever 8. Lever 8 and idler 12-are not necessary for the accomplishment of my object when the weight of the rod 6 is suflicient to pull it to adownward position by gravity, but when addi- In a device of the character described the combination of a base member, aligned guides attached to the base member, a rod adapted to move forth and back through said guides, a lever pivoted at one end to the base member and having means for ap plying a lifting and depressing movement at the opposite end, the lever being provided with a curved upper surface, a roller pivoted to the rod and positioned so that as the lever is moved, the upper portion will engage said roller, and a duplicate lever pivoted to said base and a roller pivoted to the rod adapted to engage the lever on the downward move-' ment of the lever.

JESSE F. ROGERS. 

